Out of memory on boot with kernel 6.8

[zorrog]

I've been running PVE with kernel 6.5 (6.5.13-6-pve as of now) for a while. Trying to boot the same installation with 6.8.8-4-pve immediately shows Out of memory error.
Any ideas much appreciated.

 

[Azunai333]

Are you using iommu/PCI passthrough?
Since the 6.8 kernel it defaults to "on" on intel CPUs.
If you are not using it, you could try to disable it:

Kernel: intel_iommu now defaults to on​

The intel_iommu parameter defaults to on in the kernel 6.8 series. Enabling IOMMU can cause problems with older hardware, or systems with not up to date BIOS, due to bugs in the BIOS.

The issue can be fixed by explicitly disabling intel_iommu on the kernel commandline (intel_iommu=off)

https://pve.proxmox.com/wiki/Roadmap

What hardware are you using?
Maybe try to update your BIOS.

 

[zorrog]

I do use IOMMU/PCIe passthrough and have intel_iommu=on.
CPU is Core 12700, 32GB RAM. UEFI is from Dec 2023, the only more recent update is a mitigation for Intel's 13/14 gen issues.